Sven Schreiber a écrit :
  

artur.bala schrieb:
  
    

Hello,

I'm working with an unbalanced panel data and want to sub-sample on a
dummy variable which has no mising values throughout the full sample. Is
it normal that the outcome contain many empty observations?

    
      

Or do you mean the
missings suddenly appear after the subsampling and weren't there before?
  
    

That's it. What surprised me is that I've got missing values (empty 
observations) even for the dummy variable instead of having 0 or 1.
In addition, once I set the sample on dummy=0 and want to reset it on 
dummy=1 (using the --replace and --restrict flags) that's the full 
sample coming out.
thanx,
artur

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